title: Di-hydro-cyclam dimaleate [H2(cyclam)(maleate)2].
abstract: The asymmetric unit of the title mol-ecular salt [systematic name: 1,4,8,11-tetraazacyclotetradecane-1,8-diium bis(3-carboxy-prop-2-enoate)], C10H26N4 (2+)·2C4H3O4 (-), contains two half-cations (both completed by crystallographic inversion symmetry) and two maleate anions. The cyclam macrocycles adopt trans-III conformations, supported by two intra-molecular N-H⋯O hydrogen bonds. The O-bonded H atom of each maleate ion is disordered over two positions with an occupancy ratio of 0.61 (5):0.39 (5): each one generates an intra-molecular O-H⋯O hydrogen bond. In the crystal, the cations are linked to the anions by N-H⋯O hydrogen bonds, generating [001] chains.
authors.affiliation: LCMSN, Département de Chimie, Faculté des Sciences, Université Moulay Ismail, BP 11201, 50000 Meknès, Morocco.
authors.forename: Mbonzi Ombenga
authors.initials: MO
authors.lastname: Mireille Ninon
authors.forename: Mohammed
authors.initials: M
authors.lastname: Fahim
authors.forename: Mohammed
authors.initials: M
authors.lastname: Lachkar
authors.forename: José Luis
authors.initials: JL
authors.lastname: Marco Contelles
authors.forename: Josefina
authors.initials: J
authors.lastname: Perles
authors.forename: Brahim
authors.initials: B
authors.lastname: El Bali